Apparatus eor pastettrizing



S. J. VAN KUREN.

comma, AND RIPENING MILK, CREAM, AND OTHER LIQUIDS.

APPARATUS FOR PASTEURIZING,

APPLICAHON FIL'ED SEPT-24,1917.

Patented Oct. 28, 1919.

FRI-L an w ture includes the liquid reservoir 6, the injector 7, the driving mechanism '8, shaft 9' UNITED STATES PATENT orrIoE.

STEPHEN J. KUREN, OF CEDAR. RAPIDS IOWA,

ASSIGNOR 'ro J. G. cnnnnr comm, or onnmnnrrns, iowa'nconrom'rron OF IOWA.

.AJPPABATUS r013. rasrnumznve, cooLINe, AND nrrnme MILK, CREAM, AND orHnn.

LIQUIDS.

Specification of Letters Patent.

' Patented Oct. 28, 1919.

Application filed September 24, 1917. Serial No. 192,893.

To all whom it may concern:

Be it known that I, STEPHEN J. REN, a citizen of the United. States, residing at Cedar Rapids, in the county of Linn and State of Iowa, have invented 'certain new and useful Improvements in Apparatus for Pasteurizing, Cooling, and Ripening Milk, Cream, and other Liquids, of which the following is a specification.

This invention relates to apparatus for pasteurizing cooling and ripening liquids and its object is to provide a rotatable heat interchanging member which is strong, durable and relatively inexpensive and which combines the highest degrees of efficiency and uniformity of operation with structural simplicity. I

Further objects and advantages of my invention will be apparent as it is better understood by reference to the following specification when read in connection with the accompanying drawing illustrating the preferred embodiment thereof in which- Figure 1 is a side elevation of a heat interchanging member according to my invention, the receptacle in which it operates together with the appurtenant mechanism being outlined for the purpose of more clearly defining the objects of the invention Fig. 2 is an end elevation of the heat interchanging member; and

Fig. 3 is an enlarged detail in section: of a portion of the shaft showingthe method of connecting the ends of the coils thereto.

Referring to the drawing the receptacle 5 and the appurtenant mechanism may be of any suitable construction well known in the art, and for example may be identical with the structure disclosed in Letters Patent No. 1,224.981 patented May 8, 1917, which struc- 1ournaled in the ends of the receptacle 5 for supporting the heat interchangin coils,

means 10 for admitting air to the eat in-' terchanging member and the outlet for returning the circulating liquid to the reservoir 6. 1

The heat interchanging member comprises the shaft 9 above referred to, which is -pref erably hollow throughout and plugged adjacent its ends by inserting copper disks 12 VAN Kn and pouring layers 13 of lead or other suit- I able metal thereover.. The hollow ends of the shaft 9 are provided with tinned copper linings 9 and diametrically opposite openings and are. preferably surrounded by sleeves 14 of tinned brass or other. suitable material having tubular bosses 15 registering with the openings and adapted to receive the ends of the. coils 16 and 17 which ends of-the shaft 9 and that liquid entering one end of the shaft is divided into two equal streams which flow through the respective coils, and are eventually delivered to the opposite hollow end of the shaft 9 whence the combined stream flows to the reservoir as described'in the patent above referred to.

The coils are supported'at Intervals by braces 19 mounted on the shaft 9 and having socketsat their ends to partially, embrace the coils. 16 and 17. The coils are secured in the sockets by soldering or in any other suitable manner and the construction throughout is such that the heat interchanging member is rigid and will therefore continue to performits functions almost indefinitely with a minimum of attention and necessary repair. o

The heat interchanging member, compr1sing a plurality of coils, presents numerous .advantages over a heat interchanging member made up of a single coilasshown in the patent referred to, among wh ch are rapid circulation resulting in the highest degree of efliciency and a considerable saving 1n the length of .the copper tubing which makes a construction more compact and less expensive. The arrangement of the coils disclosed in the present application is peculiarly. ad; vantageous in thateach of the cplls operates uniformly carrying equal quantlties of fluid which results in the maintenance of a more uniform temperature when the apparatus is in operation. With the construction described the desired heating or cooling may be obtained with coils of minimum length.

When the apparatus is used for cooling the liquid in the receptacle cold water or brine is circulated through the twin coil heat interchanging member automatically by the revolution of the member and the admission of air through the air inlet; when the apparatus is used for heating liquid in the receptacle hot water may be circulated in a similar manner, but ordinarily the air inlet is closed and circulation through the coils is maintained by pressure of the steam admitted through pipe 23 to heat the water. To operate the machine for cooling, and assuming that the coils are empty, the circulating reservoir or tank 6 is filled with Water to the top of the overflow pipe 20, gate valve 21 and air cock 22 are opened, and power is applied through the driving mechanism to revolve the heat interchanging member. Water will flow by gravity into the coil whose first convolution is in down position and by the time the inlet to this coil reaches a horizontal plane in the continued revolution of the member there will be a slug of water in the coil oc cupying the lower half, more or less, of the first convolution. This slug of water remains at the bottom of the coil but travels bodily lengthwise of the coil from convolution to convolution thereof as the coil revolves." The inflow of water to each coil is intermittent, a slug of water flowing into each coil while the inlet thereto is in down position. As the inlet opening passes to up position the inflow of water ceases, and since the slug of water remains at the bottom of the coil air is sucked in through the air inlet until the water again flows into the coil. Thus the coils are partly filled with water, there being alternate slugs of water and air in each coil, water flowing into one coil while air is being sucked into the other. The lower portion of each convolution of each coil is filled with water and the upper portion with air. In large machines it may be necessary to add more water to the reservoir, but after circulation is properly started the height of the water in the reservoir will not materially affect the circulation so long as it submerges the injector and pre vents air being sucked therethrough. The water and air slugs always maintain their positions relative to each other and in the coils, and as each coil discharges alternately with the other coil there'is a constant discharge of water into the reservoir produced by the combined streams from the two coils.

After circulation is established the air cock should be ad usted to regulate the inflow of air; too much air reduces the volume of water in the coils While too little air increases the volume of water in the coils.

With twin coils having equal capacity, as in the present invention, twice as much liquid can be circulated through the coils in parallel in a given time as is possible with a single coil or with twin coils arranged in series. And since the flow of liquid is more rapid and more constant the desired temperature may be maintained more uniformly than has heretofore been possible with apparatus in general use.

It has been customary to make the convolutions of a single coil with a six inch pitch but in the commercial manufacture of apparatus embodying the present invention I have made the convolutions of each coil of the twin coil with a twelve inch pitch. I find that this produces a more thorough endwise movement of the liquid in the receptacle when the twin coil is in operation than is obtained with a single coil, with the same coil speed. This increase in the movement of the liquid in the receptacle is gentle and free from whipping or splashing and is a highly desirable result in machines of this kind.

Obviously various changes may be made in the form, construction and arrangement of the parts without departing from the spirit and scope of the invention or sacrificing any of its material advantages, the form hereinbefore described being merely a preferred embodiment thereof.

I claim:

1. In a liquid tempering apparatus, the combination of a receptacle and a closed tempering-liquid circulating system, said system comprising a tank, a plurality of liquid-circulating pipe coils rotatable about the same axis within the receptacle, the inlet ends of the coils being in communication with a lower portion of the tank and the outlet ends of the coils being in communication with an upper portion of the tank, said coils being duplicates and having the convolutions of one coil alternating with those of another coil, and an air inlet for the inlet ends of the coils.

2. In a liquid tempering apparatus, the combination of a receptacle and a closed tempering-liquid circulating system including liquid-circulating pipe coils rotatable about the same axis within the receptacle, said coils being duplicates and having the convolutions of one coil alternating with those of another coil.

3. In a liquid tempering apparatus, the combination of a receptacle and a closed tempering-liquid circulating system, said system including a shaft rotatable within the receptacle and having hollow ends, hollow bearing nipples to which the shaft is connected, a plurality of liquid-circulating pipe coils connected at corresponding ends to the interiors of the respective hollow ends of said shaft, a circulating tank, stationary means disposed within said tank adjacent the bottom thereof and adapted to be constantly the like comprising a horizontal shaft having hollow end portions with opposite openings therein, an air inlet for one hollow end portion, sleeves on said shaft having hollow bosses registering with said openings, and a pair of helical pipe coils of substantially equal dimensions arranged about-said shaft so that their respective convolutions alternate longitudinally thereof, the ends of said coils being secured in said bosses, whereby fluid entering the coils through the end portion having the air inlet will be induced by the revolution of the member to flow throu h both coils in parallel and discharge there rom into the other hollow end portion.

5. A horizontal heat interchanging member for pasteurizers, coolers, ripeners, and

the like comprising a pair of helical pipe coils nested one within the other with the convolutions of one alternating with the convolutions of the other, a fluid inlet conduit and a fluid outlet conduit common to both coils, said coils bein connected to said inlet conduit on opposlte sides thereof and correspondingly connected to the outlet conduit, an air inlet for the fluid inlet conduit, and means for rotating said member, whereby said coils will alternately take in fluid and air intermittently and the same will be induced by the rotation of the member to flow through the coils in parallel.

6. A rotatable heat interchanging member for pasteurizers, coolers, ripeners and the like comprising a horizontal shaft having hollow end ortions with opposite openings therein, sleeves on said shaft having hollow bosses registering with said openings, and a pair of helical pipe coils of substantially equal dimensions arranged about said shaft so that their respective convolutions alternate longitudinally thereof, the ends of said coils being secured in said bosses, whereby fluid entering the coils through one of said end portions Will be induced by the revolution of the member to flow through both coils and discharge therefrominto the other hollow end portion.

STEPHEN J. VAN KUREN.

Witnesses I G. E; MELSA, W. L. CHERRY. 

